(noun.) a flight in which the aircraft pilot is unaccompanied.
(noun.) any activity that is performed alone without assistance.
(noun.) a musical composition for one voice or instrument (with or without accompaniment).
(verb.) perform a piece written for a single instrument.
(verb.) fly alone, without a co-pilot or passengers.
(adj.) composed or performed by a single voice or instrument; 'a passage for solo clarinet' .
手打:索菲
汉弗莱手打